/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.operations.command;

import org.apache.flink.table.operations.Operation;

import javax.annotation.Nullable;

import java.util.Optional;

/**
 * Operation to represent RESET command. If {@link #getKey()} is empty, it means reset the session
 * configuration.
 */
public class ResetOperation implements Operation {

    @Nullable private final String key;

    public ResetOperation(@Nullable String key) {
        this.key = key;
    }

    public Optional<String> getKey() {
        return Optional.ofNullable(key);
    }

    @Override
    public String asSummaryString() {
        if (key == null) {
            return "RESET";
        } else {
            return String.format("RESET %s", key);
        }
    }
}
